THE URINIFEROUS TUBULES 



349 



frequent union they become rapidly larger, and in the apex of each 

 Malpighian pyramid finally form abont a score of large terminal 

 tubules, the ducts of Bellini. Though shorter than the convoluted 



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Fio. 286. FROM THE CORTEX OF THE HUMAN KIDNEY; A MEDULLARY RAY IN OBLIQUE 



SECTION. 



a, labyrinth ; ft, spiral tubule ; c, c, collecting tubules ; </, Henle's tubule. Hematein and 

 eosin. Photo, x 135. 



tubules, the straight collecting portions, because of their direct 

 course, traverse a broader area of the renal tissue ; beginning near 

 the peripheral end of the medullary rays, in these columns they 



